Fix false positive in UnusedPrivateClass

[BraisGabin]

Fixes #2158

[codecov-io]

Codecov Report

Merging #2207 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##             master   #2207      +/-   ##
===========================================
+ Coverage     81.19%   81.2%   +<.01%     
  Complexity     2064    2064              
===========================================
  Files           340     340              
  Lines          5907    5910       +3     
  Branches       1076    1076              
===========================================
+ Hits           4796    4799       +3     
  Misses          535     535              
  Partials        576     576

Impacted Files	Coverage Δ	Complexity Δ
...rturbosch/detekt/rules/style/UnusedPrivateClass.kt	68.85% <100%> (+1.61%)	4 <0> (ø)	⬇️

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